First ultrasound. 2 yolk sacs 1 heart beat

I am 8 weeks along and I went to the doctors yesterday and got my first ultrasound done.
We happened to see 2 yolk sacs but one baby with a heartbeat. My doctor is a little concerned so she's sending me to another office that has a more high tech ultrasound machine. (I go on the 24th) has this ever happened to anyone else? What's the chances of me seeing another baby and heart beat next week?
Twins run in my family big time! My younger sister and brother are twins, and my older sister has twins, and my second cousins are twins too.

Try not to stress or worry about it right now (I know, easier said than done) just try to wait it out until the better u/s. Like PP said, some twins develop faster than others. Or the 2nd is hiding behind the 1st. Don't lose hope. Try to rest and relax for now. Fingers crossed for you!

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Married- Aug 2006Ethan- June 2008Jacob- March 2012Baby #3 - January 2015 Its a GIRL!!

At 7 weeks I also had one baby and one empty sac. I ended up bleeding and expelling the second sac at 10 weeks. Dont give up hope, everyone is different and twins can grow at different rates. But also prepare yourself for anything. Keep us posted on your next ultrasound.

At six weeks, I had 2 sacs and 1 heartbeat. At 7 weeks the second heartbeat had just started and was barely visable. I'm going back in Friday (at 9 weeks) and hoping Baby B has a strong heartbeat like Baby A.